Connection for electric conduits.



APPLICATI 0N FILED JULY 2. l9l2.

Patented May 22, 1917.

i-gzsaz WITNESSES:

UNlTElfih lffif' ii lel P GEORGE L. STE\N.ART. OF SYRACUSE, NEW YORK, ASSIGNOR T0 CBOUSE-HINDS COM- PANY, OF SYRACUSE, NEW YORK A CORPORATION OF NEl/V YORK.

CGNNEC'IEGN FDR ELECTRIC CONDUITS.

. v Specification of Letters Patent.

lalcntcil. Kay 5523. .1.

' Application filed. Ji'uly 2, 1912. Serial No. 707,159.

To all whom it mu come/'11.:

39 it known that, l, Gnome L. STEWART, of l."i \'1acuse. in. the county of Onondaga. and Staie of New York, have invented a certain new and useful Connection for Electric Conduits, of which the following is av specification.

This invention has for its object the pro (lllltlOIl of a connection for conduits cspeeially electrical conduits. in which it is particularly necessary to guard. against the en trance of moisture into the conrluits at the joints. and it con sts in the features of construction hercinaflcr set forth ainl claimed.

ln describing this invention reference is had to the accompanying drawing in which like characters (lesiguaie correspmiding par-is in all the views.

Figure 1 is a longitudinal sectional view of a conduit outlet hon used in electrical construciion, thebox being provided with my invention.

Fig. 2 is an enlarged fragmentary new oione end of: such hon Wl'ilh the elecmrical con- ,(luit iurnecl therein against the gaske'i.

member 52, said nipple having; an annular recess 4 at the inner enci of ils "'lireao ecl passage, and recess lacing preferably rectangular in cross seciion. The member 1 is also provlcled with an annular shoulder or the abutment 6 at the inner sicie of each recess anfi at the extreme inner encl of each nipple 3, this abutment or shoalrler Toeing of less diameter than the threalecl passage of she nipple and locsteri in position to he opposedl to the curl edge face of the pipe threarling in the passage 3.

53 is an element forming part of she joint between the members 1. 2. saicl element being' a gasket located in ilie recess .4 ani'l formccl oi yielcling' material as rubber. the gasket being: of a eliflcrcnt form in cross section from that of the recess i and haying an internally' inclined face prcsentci'l roward lx'ie passage o? the nipple fl in orrler to he engaged h v the mlvance earl of the pipe 3, as the same is being turned in the nipple. and i'orcerl or compressed by the cml lllfie face of the pipe against the shoul- (101 o and also outwarillv by such pipe as the pipe advances so that said gasket will conform to 'thc periphery of lhe pipe and to the contour of the recess 4.. The cornpressing of the gasket- .()\\211(i the shoulder ll anrl the cutting into the inner inclinedL face of the gasket. causes the gasket lo he distorted outwarill or in a. direction opposite to that in which the force is applied by the pipe moving into the thruuleil passage. llencc. the gasket is caused to tighlly and snugly engage :he walls of the recess anrl the threads of file pipe.

The yielding" action of the 5;: ct lakes place wiihout tearing. owing to {he il" llll-5 l face and to the lliil'ereni cross se 'onal forms of the recess 4- aiul gasket 5.

As here shown the gasket is rounrling in cross section and the internal diameter lhere of is less than ihe exterior diameter of the pipe 2. so that 'the advance curl of the pipe engages the curved internal face of the in operation, as the. pipe 2 is iurnocl into I i the nipple 3. it engages the opposing inner ellipticalljr curved or inclined face of the gasket and forces the gasket. without tearing the same. info a. position such as the. shown in Fi 2.

Whai I claim is:

1. In a connection ior conrl' hination of two couduili xneini formed with a "rhrerulecl passzn largerl recess at the inner end of said pas sage and also with a shoulder at the inner end of the recess. the shoulder being of l.-. diameter lhan ille lhrearleil passag i orlicr member being a pipe threading in the passage. aml a gasket of yielding material in the form of a ring arrange-(l in the recess ani'l being of (liilerent ross sectional form from that 01'' the. recess, the internal (liameler oi sairl ring being; less than 'xhc (liainetcr of the threaded passage. the ring" having an internal. inclined annular face arranged to he engaged by the ailvancc llllfifllfil curl of the pipe and lay the annular cn l face of the pipe. whcreh r (he gasl' is forced against sairl shoulder ancl disterlco;

said passage and also with an annular abutment at the inner side of the recesses, the abutment being of less diameter than that of the threaded passage. and the other member being a pipe threading in said passage, and a gasket of '1Eld1ng material in the form of a ring arranged partly in therecess and having its inner diameter less than the diameter of the threaded passage," the ring being rounding in cross section and having its inner diameter less than the diameter of the passage and also having a receding inner inclined annular face arranged to be engaged by the threaded end of the pipe and also by the annular edge face of the pipe whereby the advance threaded end of the pipe engages the inclined internal face of the ring as said pipe is being turned in the passage and the annularend edge face of the pipe forces the gasket against said abutment so that the gasket distorted to conform to the recess. and said recess being of different Cross sectional form from the gasket, substantially as and for the purpose specified. i

In a connection for electric conduits the combination of two'conduit members, one being tot-med with a threaded passage,

and an enlarged annular recess at the inncl',

v gasket being less than'theextci'nal diameter of the pipe whereby the advance end of the pipe engages the curved internal face of the gasket assuch pipe is being turned into the passage and thereby causes the gasket to conform without tearing to the contour of the recess and the threaded periphery oi the pipe. substantiall as and for the purpose set forth,

In testimony whereof. l have hereunto signed my name in the presence of two attesting witnesses. at' \'racuse. in the count of ()uomlaga-Qand State of New York, this Hth lu of June. 1912.

(llCOR .lE L. STFJYART. 'itnesses: I

C. C. b'unonxncn, WM. ConxrLL Bni'xnixo, 

